ProjectExplorer: Use simpler signature for ApplicationLauncher::processExited()

And rename it to finished().

Maps better to what QtcProcess uses.

Change-Id: Ibfa018549f436b27638a791c0b4937c4459c9452
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/boot2qt/qdbdevicedebugsupport.cpp

@@ -57,7 +57,7 @@ public:
 
         connect(&m_launcher, &ApplicationLauncher::processStarted,
                 this, &RunWorker::reportStarted);
-        connect(&m_launcher, &ApplicationLauncher::processExited,
+        connect(&m_launcher, &ApplicationLauncher::finished,
                 this, &RunWorker::reportStopped);
         connect(&m_launcher, &ApplicationLauncher::appendMessage,
                 this, &RunWorker::appendMessage);